<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>

    <style>
      h3 {
        word-spacing: 20px; /*英文单词间距*/
      }
      h3 span {
        letter-spacing: 20px; /*span标签中汉字间距*/
      }
    </style>
  </head>
  <body>
    <h3>
      I love you<span> <br />我的宝贝！</span>
    </h3>
  </body>
</html>
